Formwork truncation screw rod

ABSTRACT

A formwork truncation screw rod includes a self-tapping screw and at least one fixing part. The self-tapping screw includes a spiral portion around the outside of the self-tapping screw, a driving end, a tapping end at an opposite end of the driving end, a diameter shrinkage portion between the tapping end and the spiral portion, and an extending portion between the tapping end and the diameter shrinkage portion. After the tapping end is fixed to the fixing part, the diameter shrinkage portion is made to protrude from the fixing part. Then, the diameter shrinkage portion is broken to remove the tapping end, thereby preventing the tapping end from damaging to the user. In this invention, the impact to the formworks between which concrete is grouted may be decreased and the formwork support capability may be increased, and few component is needed for quick assembly and simplified process.

This application is a continuation-in-part, and claims priority, of from U.S. patent application Ser. No. 15/226,097 filed on Aug. 2, 2016, entitled “TEMPLATE MOLD SEVERING SCREW BAR”, the entire contents of which are hereby incorporated by reference.

This application claims the priority benefit of Application No. 104212502 filed in Taiwan on Aug. 4, 2015.

FIELD OF THE INVENTION

This invention relates to a formwork truncation screw rod and particularly to an easily assemble screw rod that serves as a fixing part for construction and supports a formwork

BACKGROUND OF THE INVENTION

Refer to FIG. 1 illustrating a formwork construction applied for conventional reinforced concrete grouting. Firstly, two formworks are installed on the opposite side of each other and keep a predetermined distance from each other, and an electrical drilling machine is used to drill a corresponding thru hole on each of the formworks 13 for a screw rod 1 passing through each of the formworks 13 in sequence via the thru holes. A pad 11 and a screw nut 12 are set at each ends of the screw rod 1 in sequence, and the screw nuts 12 are bolted to the screw rod 1. The screw rod 1 is fixed to each of the formworks 13 for facilitating subsequent concrete grouting.

In the process of construction, the two ends of each of the screw rod 1 set each of the pads 11 and bolted each of the screw nut 12 respectively, which adding more complicated procedures and causing more time-consuming as well as inconvenient construction.

Due to the pads 11 giving weak force of friction, powerful pressure caused in the process of grouting might make the formworks 13 shift, which brings poor quality of construction. The shifting formworks 13 deflect the solidified concrete, which leads to material-consuming for reworking the grouting or extra repairing.

Thus, to provide a technical means of quick assembly, saving time and a stable effect is an object of the present invention.

Consequently, because of the technical defects described above, to provide the rotary valve improver, the applicant, based on many years of research and experience in the relevant industry, has developed the present invention, which may effectively improve the defects described above.

SUMMARY OF THE INVENTION

This invention is mainly to provide formwork truncation screw rod that may support a formwork and may be easily assembled.

Accordingly, a formwork truncation screw rod according to this invention comprises a self-tapping screw and at least one fixing part. The self-tapping screw includes a spiral portion formed around the outside of the self-tapping screw, a driving end, a tapping end at an opposite end to the driving end and larger than the spiral portion in width diameter, a diameter shrinkage portion formed between the tapping end and the spiral portion, and an extending portion formed between the tapping end and the diameter shrinkage portion.

The fixing part is fixedly screwed onto the spiral portion. The fixing part includes a fixedly screwed portion and a leaning portion fixed to one end of the fixedly screwed portion. The fixedly screwed portion includes a screw hole onto which the spiral portion may be fixedly screwed. The screw hole includes at least one groove matching with the tapping end for extending and passing through. The leaning portion has a thru hole communicating with the screw hole. After tapping end is connected and fixed to the fixing part, the diameter shrinkage portion is made to protrude out of the fixing part, and thereby the diameter shrinkage portion is broken to remove the tapping end.

Being compared with the prior art, this invention has the following advantages.

1. The self-tapping screw is extended and fixed on the formwork in a process of drilling, which makes the construction more fast, easy, and efficient and better than the defective time-consuming prior art in which the formwork is drilled first and then the screw is extended and fixed to the formwork, which is completed in two times of construction procedures.

2. The fixing part has a friction end that makes the fixing part more stable and not easily to move on the formwork, thereby decreasing the impact to the formworks between which concrete is grouted and increasing the formwork support capability.

3. The self-tapping screw is installed on the formwork in one process, which is provided a reinforcement solution to avoid mold collapsing happens when the formwork grouting is implemented.

4. The tapping end is larger than the spiral portion in width diameter, so the diameter of a hole formed at the time of drilling is larger than the spiral portion, and thereby the spiral part not only may easily pass through each of the formworks, but also users are allowed to adjust the space of parallel shifting of each of the formworks, more in line with the construction site requirements.

The foregoing objectives and summary provide only a brief introduction to the present invention. Other objects, features, and advantages of the present invention will become conspicuous to those skilled in the art upon reading the following detailed descriptions accompanying by the illustrations.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic view illustrating an operation state of a prior art.

FIG. 2 is a 3D exploded view of a formwork truncation screw rod according to this invention.

FIG. 3 is a schematic view illustrating an operation state of the formwork truncation screw rod according to this invention before drilling.

FIG. 4 is a schematic view illustrating an operation state of the formwork truncation screw rod according to this invention during drilling.

FIG. 5 is a schematic view illustrating an operation state of the formwork truncation screw rod according to this invention during drilling.

FIG. 6A is a plane view of the formwork truncation screw rod according to this invention of which a driving end is a triangular pillar.

FIG. 6B is a plane view of the formwork truncation screw rod according to this invention of which the driving end is a quadrilateral pillar.

FIG. 6C is a plane view of the formwork truncation screw rod according to this invention of which the driving end is a pentagonal pillar.

FIG. 6D is a plane view of the formwork truncation screw rod according to this invention of which the driving end is a hexagonal pillar.

FIG. 6E is a plane view of the formwork truncation screw rod according to this invention of which the driving end is a heptangular pillar.

FIG. 6F is a plane view of the formwork truncation screw rod according to this invention of which the driving end is an octagonal pillar.

FIG. 6G is a plane view of the formwork truncation screw rod according to this invention of which the driving end is an enneagonal pillar.

FIG. 6H is a plane view of the formwork truncation screw rod according to this invention of which the driving end is a decagonal pillar.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

The following descriptions are exemplary embodiments only, and are not intended to limit the scope, applicability or configuration of the invention in any way. Rather, the following description provides a convenient illustration for implementing exemplary embodiments of the invention. Various changes to the described embodiments may be made in the function and arrangement of the elements described without departing from the scope of the invention as set forth in the appended claims.

Refer to FIG. 2 illustrating a formwork truncation screw rod 2 that is applicable in a template architecture construction. The formwork truncation screw rod 2 comprises a self-tapping screw 3 and at least one fixing part 4. The self-tapping screw 3 includes a spiral portion 31 formed around the outside of the self-tapping screw 3, a driving end 32 formed at an end of the self-tapping screw 3, a tapping end 33 opposite to the driving end 32 and larger than the spiral portion 31 in width diameter, a diameter shrinkage portion 34 formed between the tapping end 33 and the spiral portion 31, and an extending portion 35 formed between the tapping end 33 and the diameter shrinkage portion 34.

The tapping end 33 includes a cutting portion 331 formed at a side of the tapping end 33 and a chip discharging portion 332 formed near a side of the cutting portion 331. The driving end 32 is a polygonal pillar 321 and may be triangular, quadrilateral, pentagonal, hexagonal, heptangular, octagonal, enneahedral, decagonal and the like, as shown in FIG. 6A through FIG. 6H. In this invention, the driving end 32 formed into the hexagonal pillar is taken for example and is not limited to this invention.

The fixing part 4 is fixedly screwed onto the spiral portion 31. The fixing part 4 includes a fixedly screwed portion 41 and a leaning portion 42 fixed to one end of the fixedly screwed portion 41. The fixedly screwed portion 41 includes a screw hole 411 onto which the spiral portion 31 may be fixedly screwed. The screw hole 411 includes at least one groove 412 that passes from one side of the fixing part 4 through the other side, and the groove 412 also matches with the tapping end 33 for extending and passing through. The leaning portion 42 includes a thru hole communicating with the screw hole 411. The leaning portion 42 is non-plane and has a friction end 421 far from a side of the fixedly screwed portion 41. The friction end 421 is formed into at least one hemispheroid, or at least one spheroid, or at least one groove, or at least one rib, or at least one polygonal pyramid, or at least one conoid, or at least one saw tooth.

Refer to FIG. 2 through FIG. 5 that illustrates a practical use and a sleeve 5 included at the time of practical use. The sleeve 5 includes a connection portion 51 sleeved around the driving end 32, and a driven portion 52 formed at an opposite side of the connection portion 51. A user firstly connects a power machine to the driven portion 52 for a predetermined construction area. The connection portion 51 is then sleeved around the driving end 32, and the power machine even may be connected to the driving end 32. Then the power machine is activated to drive the self-tapping screw 3 through the sleeve 5 to turn. The cutting portion 331 is thereby made to drill on the two formworks 6 that are set.

The tapping end 33 is larger than the spiral portion 31 in width diameter, so the diameter of a hole formed at the time of drilling is larger than the spiral portion 31, and thereby the spiral portion 31 not only may easily pass through each of the formworks 6, but also the user is allowed to adjust the space of shifting of each of the formworks 6, more in line with the construction site requirements. With the extending portion 35, when being made to rub and drill on the formwork 6, the tapping end 33 may be supported and strengthened so as not to make the tapping end 33 to be broken and drop. Further, with a chip discharging space 333 formed in the chip discharging portion 332 to collect chips caused during drilling, the chips are gradually accumulated in the chip discharging portion 332 and, when the self-tapping screw 3 turns and drives to each of the formworks 6, the chips are accumulated and discharged toward the diameter shrinkage portion 34, thereby preventing the chips accumulated in the drilled hole from decreasing the resistance caused when the tapping end 33 is made to drill on each of the formworks 6.

Apparently from the description mentioned above, after the self-tapping screw 3 passes through the formwork 6 at the left side, the fixing part 4 at the left side is sleeved around the cutting portion 331 so as to make the groove 412 receive the cutting portion 331 and then to control the screw hole 411 to directly pass through the cutting portion 331, thereby the screw hole 411 being screwed onto the spiral portion. The leaning portion 42 of the left-side fixing part 4 closely leans against a side of the left-side formwork 6 and the friction end 421 is made to lean against the left-side formwork 6. Finally, the right-side fixing part 4 is made to pass through the right side of the self-tapping screw 3 and is fixedly screwed to the spiral portion 31, thereby making the leaning portion 42 of the right-side fixing part 4 closely lean against a side of the right-side formwork 6 and making the friction end 421 lean against the right-side formwork 6. The fixing parts 4 are installed opposite to each other at a reverse direction. Accordingly, the self-tapping screw 3 may be fixed between the formworks 6 for facilitating subsequent concrete grouting.

Further, after the tapping end 33 is connected and fixed to the fixing part 4, the diameter shrinkage portion 34 is made to protrude out of the fixing part 4. Then, a tool is used to break off the diameter shrinkage portion 34 to remove the tapping end 33, thereby preventing the tapping end 33 from doing damage to the user, as shown in FIG. 5. Besides, with the help of friction end 421 installed, when each of the fixing parts 4 leans against each of the formworks 6, a preferable force of friction is applied to resist the powerful pressure caused during grouting so as not to make each of the formworks 6 subject to shift and to prevent problems caused by the concrete grouting. During construction, when each of the formworks 6 cannot bear any transversal pressure caused by the concrete grouting and then collapse, an extra fixing part 4 may be used to temporarily strengthen the structure for implementation of the continuous construction procedures and effective control of the construction quality.

As described above, being compared with the prior art, this invention provides only the self-tapping screw 3 passing through each of the formworks 6, and each of the fixing parts 4 being reflectively fixedly screwed onto the two ends of the self-tapping screw 3, thereby making each of the formworks 6 to be located between the fixing parts 4 for simplifying the construction process and significantly increasing the convenience of the overall construction. 

What is claimed is:
 1. A formwork truncation screw rod, being provided for template architecture construction and comprising: a self-tapping screw, including a spiral portion formed around the outside of the self-tapping screw, a driving end, a tapping end at an opposite end of the driving end, a diameter shrinkage portion formed between the tapping end and the spiral portion, and an extending portion formed between the tapping end and the diameter shrinkage portion, in which the tapping end is larger than the spiral portion in width diameter; and at least one fixing part, in which the fixing part is fixedly screwed onto the spiral portion, the fixing part includes a fixedly screwed portion and a leaning portion fixed to one end of the fixedly screwed portion, the fixedly screwed portion includes a screw hole onto which the spiral portion may be fixedly screwed, the screw hole includes at least one groove matching with the tapping end extending, and the leaning portion includes a thru hole communicating with the screw hole, in which after the tapping end is connected and fixed to the fixing part, the diameter shrinkage portion is made to protrude out of the fixing part and thereby the diameter shrinkage portion is broken to remove the tapping end.
 2. The formwork truncation screw rod according to claim 1, wherein the tapping end includes a cutting portion formed at a side of the tapping end and a chip discharging portion formed near a side of the cutting portion.
 3. The formwork truncation screw rod according to claim 2, wherein the chip discharging portion has a chip discharging space.
 4. The formwork truncation screw rod according to claim 1, wherein the driving end is a polygonal pillar that is triangular, quadrilateral, pentagonal, hexagonal, heptangular, octagonal, enneahedral, or decagonal.
 5. The formwork truncation screw rod according to claim 1, wherein the leaning portion is non-plane and has a friction end far from a side of the fixedly screwed portion.
 6. The formwork truncation screw rod according to claim 1, wherein the friction end is formed into at least one hemispheroid, or at least one spheroid, or at least one groove, or at least one rib, or at least one polygonal pyramid, or at least one conoid, or at least one saw tooth.
 7. The formwork truncation screw rod according to claim 1, wherein the formwork truncation screw rod includes a sleeve and the sleeve includes a connection portion sleeved around the driving end, and a driven portion formed at an opposite side of the connection portion. 